Longitudinal edges of the plates are then tack welded followed by internal and external welds, using double-sided
submerged arc welding and flaring from production.
The coherence of cutter head and plate clamping system guarantees the invariable parameters during the entire
milling process; accordingly, it ensures the milling quality and lays a good foundation for the success of subsequent
Pipes manufactured by this process are subjected to expanding operation to relieve internal stresses and obtain a
perfect dimensional tolerance.
After the pipes are conveyed to cold expansion, hydrostatic testing and NDT inspection, the pipes will be subject to
final inspection for the compliance to customer requirements.
– ASTM 53
– API Spec 5L
– ASTM A252-89, EN10217, EN10219
ERW pipe is a high-speed production product, that can be made in continuous lengths up to 115’(35m). It produces
uniform wall thicknesses and outside dimensions and is made in a wide range of specifications.
It does, however, require minimum tonnage to set up on a specific size and sometimes has long lead times.
– API 5L: GR A, GR B, X42, X46, X56, X60, X65, X70
– ASTM A252 GR 1, GR 2, GR 3
– ASTM A53: GR A, GR B, GR C, GR D
– BS 4360: Grade 43, Grade 50
– EN: S275, S275JR, S355JRH, S355J2H